Read the following passage and answer the questions:
Our body has a defence system to protect against invading microbes. The outermost line of defence is the barrier that prevents the entry of microbes into the body, and if they enter, phagocytic cells kill the microbes. This forms the local defence system of the body. The innermost line of defence includes the formation of specific antibodies that combine with the antigen (microbe) and then destroy it. This is called specific immunity.
How is the local defence system different from the antibody-producing specific immune system?

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Solution

Specific immune system:
Specific immunity is acquired after a pathogen invades our body and it involves the sensitisation of specific cells of the immune system (B and T lymphocytes)
These cells, especially the B-lymphocytes then secrete antibodies which are specifically produced to fight the invading pathogen.
Difference between local defence system and specific immune system:
The local defence system reacts and responds in exactly the same way for any invading pathogen, whereas the response in the case of the specific immune system is different for different pathogens.

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Read the following passage and answer the questions:

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